Is there an addon for one-click change from RTH to ETH?

NT8 does not have a simple one-click method for switching between Regular Trading Hours and Electronic Trading Hours.
We can do this manually by opening the Data Series properties and scrolling through dozens of trading hour templates to find the one you are looking for. Very tedious and clumsy. Easy to make a mistake.

I am hoping that someone has already created an addon which places a button on the tool bar of the chart to do this in one-click. Let me know if anything like this exists.

Thanks!